Jasper e



UNITED' STATES PATENT OFFICE.

JASPER IE. GRAIN'E, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE ARLINGTON COMPANY, OF ARLINGTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PROCESS OF PURIFYING CAMPHOR.

No Drawing.

To all whom it may concern:

Be it known that I, JAsrnn E. CRANE, of Newark, in the county of Essex, and in the State of New Jersey, have invented a certain new and useful Improvement in Processes of Purifying Camphor, and do hereby declare that the following is a full, clear, and exact description thereof.

The object of my invention is to obtain a purified camphor. Crude camphor contains as impurities camphor oil, resinous impurities, water and dirt.

It is the object of my invention to remove these impurities substantially entirely and in a most ex editious and economical manher. The ob ect is particularly, however, to remove the camphor oil.

While my invention is capable of embodiment in many different forms, for the purpose of illustration I shall describe only one of the many ways in which my invention may be carr ed out.

According to my invention the camphor to be purified is subjected to a heating operation which has the effect of changing the character of the eamphor oil so as to permit it to be readily separated from the camphor. Afterward the camphor may be purified in any suitable manner to remove the impurities.

As one example of carrying out my invention; crude or impure camphoris heated in a securely closed vessel or retort, at a temperature of 300 to 500 F. for referably about 30 minutes to 1-} hours. hebrganic imu'rities such as eamphor oil and resinous matters will now be found to have become modified into either nonvolatile substances or substances having a difierent volatility than camphor or both. The substances thus formed are furthermore not soluble in the ordinary organic solvents. The camphor itself is not decomposed nor is it altered chemically to an appreciable degree at the above temperatures.

The "heated product now com rises cam- 3161", decomposed oil and other ecom osed ganic 1m critics, Water and dirt. y introdueifig are (it some other water absorb- Specification of Letters Patent.

Patented July 1, 1919.

Application filed May 26, 1916. Serial No. 100,152.

ing material into the retort, the water may b; taken up during the heating of the camp or.

Purified cam hor can be obtained from this heated pr method. For example, the heated product can be purified by solution in naphtha, separation from the layer of water, filtration. distillation to separate the solvent and crystallization.

In the purification of the camphor the heated product may be dissolved in an organic solvent, such as ethyl alcohol, naphtha. etc, so as to produce either a hot supersaturated solution so that on cooling the cam her will crystallize out, or an urisatu rate solution which will later be concentrated by distillation. If a solvent which is not miscible with water has been used, the water may now be separated by allowing the solution to stand and drawing oil the water from the bottom.

The solution can now be filtered through cloth or any other filtering medium to remove the dirt and insoluble materials. If the solution has a yellow color, which is apt to be the case, this may be removed by filtering it. preferably while hot, through boneblack.

The super-saturated solution, either made so in a hot solvent in the first instance. or made by distilling oil a portion of the solvent, is cooled in suitable pans whereu on the Mpure camphor crystallizes out an is dri by draining in a cloth strainer or by treatment in a centrifugal machine.

Instead of purifying in this way, the re tort in which the camphor has been heated may be oplened so as to allow the heat to drive off t e cam hor valpor which is subsequently condens thus istillin or subliming from a retort and condensing in any suitable manner, as for example, in a sealed chamber. 1

While I have described my invention above in detail, I wish it to be understood that many changes may be made therein without departing from the spirit of my invention;

not according to any desired I claim 2- l. A process which comprises heating camphor containing cam )hor oil for a sulficient length of time to change the camphor oil into a product more amonabie to separation from the ('amphor than is camphor oil.

2. A process which comprises heating ramphor containing camphor oil for a suflicient lengitlzi= of time to change the cam hor oil into a product having a different vo atilit from the cainphor.

3. A process which comprises heating camphor containing camphor oil to a temperature between 300 and 590 F. a sufficient length of time to change the camphor oil into a productmore amenable to separation fronrth'e camphor than is caimplior oil.

4. A process which comprises heating impure camphor to a temperature between 300 and 500 F. a sufiieient length of time to cha I c the caniphor oil into a product not readi y soluble in the ordinary organic solvents and having a different volatility from the camphor.

5. A process which comprises heating'impure camphor to a temperature between 300 and 500 F. in a closed chamber so as to modify the characteristics of the camphor oi-lcontained therein.

6 A process which comprises heating camphor containingcam'phor oil to a temperature between 300 and 500 F. in a closed chamber for a sufiicient length of time to change the camphor oil into a prodnot not readily soluble in the ordinary organic solvents and having a different voila tility from the cam pihor.

7. A process which comprises heating impure oamphor containing camphor oilto change the canrphor oil into a' product having SOlHbi-litisS difl'erent from those of eamph'or oil, and then separating the cainphor from said product,-

8. A process which comprises heating impure camphorto a temperature between 300 and 500 F. so as to modify the characteristics oi the camphor oiil contained therein; and then separating the cam phor from the modified camphor oil. 1

9. A; which compifises heating eamphor containing eamphor oil to a temperature between 300 500 F. so as to change the camphor oil intoai prodiuct not readily soluble in the ordinary organic solvents and; haV-inga diflenent volatility from the camphom; and then se arating the camphor from said product;

10. A process which comprises heating impure camphor to a temperature between 390 and 500 in a closed chiumher so as to modify the chai'acteristieeoi the camphob oi!- conmined therein, and then separating tho cannpimr from tifl'fi'lfibdififid camphor oil. 7

ll. A process which comprises heating impure camphor to a temperature between 300 and 500 F. in a closed chamber for a sullicient length of time to change the camphor oil into a product not readily soluble in the ordinary organic solvents and having a different volatility from the camphor, and then separating the eamiphor from said produce 12. A process which comprises heating impure OFLmIfhOI containing oamphor oil to change the camphor oil into a product which is less soluble in a campho-r-sol vent' than is camphor oil, and then separating, the camphor from said product by dissolving the cam phor in a suitable camphor-solvent, and

recrystallizing the camphor.

13. A process which comprises heating impure camphor containing camphor oil for a sufiicient length of time to change the camphor oil into a product not readily soluble in the ordinary organic solvents and having a different volatility from the camphor, and then separating the camphor from said product and other impurities by solution in naphtha, and recrystallization.

14. A process which comprises heating impure canrphor to a temperature between 300 and 500 F. so as. to modify the characteristics of the camphor oil contained therein, and then separating the camphor from the modified eamphor o l and other impurities by solution in naphtha, and. recrystallization.

15. A process which comprises heating impure camphor containing camphor oil to a temperature between 300 and 500" F. for a suflicient length of time to chan e the camphor oil into a product not 1' i1 soluble in ordinary orga e solvents and harm a different volatility mm the camphor, and then separating the camphor firom said product and other impurities by; solution in a suitable camphor solvent and recrystallization.

16. A process which comp i es heating impure camphor to a-temperatnre between 300 and 506 F. in a clo ed chamber so as to modify the characteristics of the camphor oil contained therein. and then separating the eamphor from the modified camphor oil and other impurities by solution in naphtha, and reerystallimtion.

17'. A panelist which comprises heating impure camphcr' containing camphcr oil to a temperature betWeBnBOQ and 50Q F. in a; closed chamber for a suflicient length of time to change the eamphor oil into a, prodnot not readily soluble in the ordinary organic solvents and having a difierent volatility from the camphcr, and then separating the cainphor from said product and other impurities by solution in a suitable eamphor soivenhand recrystalli atio 18. A process which comprises heating the solution, and recrystallizing the camphor 10 impure camphor containing camphor oil to from the filtered solution.

a temperature between 300 and 500 F. in a closed chamber for a suflicient length of time to change the camphor oil into a product not readily soluble in the ordinary organic solvents, and then separating the camphor from said product and other impurities by dissolving the camphor in naphtha, filtering In testimony that I claim the foregoing I have hereunto set my hand.

JASPER E. CRANE.

Witnesses:

J. M. KEssLER, LEON G. CORNIER.

Copies of this patent may be obtained tor five cents each, by addressing the Commissioner of Patents,

Washington, D. O. V 

